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Eduardo thinks of a number between 1 and20 that has exactly 5 factors. What number is he thinking of?
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Eduardo thinks of a number between 1 and20 that has exactly 5 factors. What number is he thinking of?

User Martineau
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16, because there is 1 times 16 (that's two factors), there's 2 times 8 ( that makes four factors), and finally 4 (which makes it five factors because the 4 is multiplied by itself to get 16 so it counts as one).
User Atmd
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